Device for sewing designs on zigzag sewing machines



March 26, 1963 YUKIO SANBE 3,082,720

DEVICE FOR SEWING DESIGNS 0N ZIGZAG SEWING MACHINES Filed April 5, 1960 4 Sheets-Sheet 1 INVENTOR ATTORNEY March 26, 1963 YUKIO SANBE 3,

DEVICE FOR SEWING DESIGNS 0N ZIGZAG SEWING MACHINES Filed April 5, 1960 4 Sheets-Sheet 2 INIENTOR YIJK/O 5 4/55 ATTORNEY March 26, 1963 YUKIO SANBE 0 DEVICE FOR SEWING DESIGNS 0N ZIGZAG SEWING MACHINES Filed April 5, 1960 4 Sheets-Sheet 3 INVENTOR Yuk/,0

ATTORNEY March 26, 1963 YUKlO SANBE 3,032,720

DEVICE FOR SEWING DESIGNS ON ZIGZAG sawmc MACHINES Filed April 5, 1960 4 Sheets-Sheet 4 INVENTOR ATTORNEY United States Patent 3,082,720 DEVIGE FOR SEWING DESIGNS 0N ZIGZAG SEWING MACHINES Yukio Sanbe, 255-4, Inyaku-Machi, Yamagata-shi, Yamagata-ken, Japan Filed Apr. 5, 1960, Ser. No. 20,163

1 Claim. (Cl. 112-102) The present invention relates to the improvements in the sewing devices for sewing letters, figures, designs, etc. by means of a zigzag sewing machine.

The devices of this invention consists of three cams mounted so as to be attachable to or removable from a rotating shaft driven from any driving shaft of a sewing machine such as that for feeding, and is characterized in that one of the cams controls through an intermediary of a lever the vibrating amplitude of the needle bar and shuttle, and the other two cams impart through levers cooperating therewith horizontal displacement to the workstretching frame disposed immediately below the needle bar on account of the resultant motion produced by these cams.

An object of the invention is to provide devices in which sewing of embroidered figures such as letter forms are automatically accomplished by means of the resultant motion from the two cams, which impart to the works the desired changes in horizontal displacement, conjointly with the changes in the zigzag stitches resulting from changes in the amplitude of vibration of the needle bar and the shuttle.

Another object is to provide for making possible the obtaining of a plurality of embroidery figures by changing these three cams with a plurality of other sets of cams which have been provided.

A further object is to provide for making precise the lateral movement of a work-holder in concomitance with the movement of a plurality of cams by means of two pairs of parallel links acting in a form of two parallelo grams.

The accompanying drawings shown an embodiment of the present invention:

FIG. 1 is a side elevational view of the machine;

FIG. 2 is a plan view;

FIG. 3 shows a partial section and side elevation of the essential parts according to the invention;

FIG. 4 is its plan view;

FIG. 5 is a plan section on the line V-V of FIG. 3;

FIG. 6 is a vertical section of the driving mechanism for the essential parts;

FIG. 7 is a vertical section on the line VII-VII of FIG. 6;

FIG. 8 is its plan view;

FIG. 9 is a vertical section of the cams arrangement of said essential part;

FIG. 10 is a perspective view of the set of three cams;

FIG. 11 is an enlarged plan view of the partial circumference of the cam;

FIG. 12 is a perspective view of the lever mechanism co-operating with said cams;

FIG. 13 is a perspective view of the main levers; and

FIG. 14 shows perspective views of the levers co-operating with said cams.

As shown in FIG. 1, the zigzag sewing machine to which this invention is applied is the same as the conventional zigzag sewing machine in that it ha a mechanism which, as a result of the rotation of the driving pulley 3, reciprocates the needle bar 4 vertically and at the same time vibrates it laterally (not illustrated), and a mechanism 5 which drives the lower stitch mechanism as well as vibrates it in correspondence with the vibration of the needle bar, and moreover is provided for adjusting the amplitude of the vibration with a knob 6 mounted on the "ice machine arm 1. However, the aforesaid vibrating motion is imparted by one of the three earns 10* which has been mounted as to be removable on the vertical shaft 8 provided as to be rotatable in the bed plate 2 of the sewing machine. As shown in FIGS. 5 and 8, a ratchet wheel 11 which is rotated by the feeding pawls 22 and 22a is carried on this vertical shaft 8. These pawls, which are urged against the wheel 11 with a spring 23, are pivoted to a slide 21, and the slide 21 is in turn guided by a groove 20 fixed in a frame mounted in the machine bed. As shown in FIGS. 6 and 7, a pin 25a carried on one end of a bell crank 25 that rocks around a pin 26 pivotally attached to the bed plate 2 engages a recess 24 on the top side of the slide 21, and a fork 25!) at the other end of the bell crank 25 engages a cam 71 provided on an oscillating shaft 7t]. As a result of the oscillation of the shaft 70, the bell crank 25 oscillates and thus by means of the engaged wall 24a of the recess 24 the slide 2.1 repeats the movements forward against a tension spring 27 and a return by said spring. Hence, by this reciprocating motion the aforesaid ratchet wheel 11 is caused to rotate intermittently in a clockwise direction in FIG. 8 by means of the pawls 22 and 22a carried by the slide 21 with the distance corresponding to the distance traveled in the aforesaid reciprocating motion. The stroke of the slide reciprocation is determined by the position 29a of an ad justing screw 29 provided in a frame 28. The two pawls 22 and 22a which match in thickness the ratchet 11 and are superposedly disposed, engage said ratchet wheel 11 with a phase difference of a half pitch and impart precision movements thereto. The shaft 8 of the ratchet wheel 11 is pivotally supported as to be rotatable in the bed plate 2 and a frame 64 secured thereto. To an extension 15 to said shaft 8 situated above the bed plate, three cams 10A, 10, and 10B of suitable profile are provided in superposed positions (as shown in FIG. 9). Grooves 16, 16 are provided diametrically in a boss 14 that is located between the shaft 8 and the extension 15. The upper part of pins 17, 17, which are inserted in these grooves, are fitted into the two holes 13, 13 respectively provided in the aforesaid three cams. And to the tips of the pins 17, 17 two holes of a capping washer 18, which match these pins, are fitted. Then next thereto at the tip of the extension is screwed a knob 19 which clamps it and the three cams. One of the three cams, for example, the middle one 10 controls the vibration of the needle bar and the lower stitch mechanism, while the top one 10A and the bottom one 103 control the lateral movements that are imparted to the work holder 46 for determining the figure desired. These carns possess respectively suitable profiles as shown in FIG. 10, and the periphery of the profiles, as shown in FIG. 11, are milled so that the tips of the levers 30, 31, 32 that follow will not slip while making contact with the respective peripheries of the profile. 7

These levers 30, 31, and 32 which are caused to operate as a result of being in engagement with the cams are provided on a vertical spindle 9 journalled in the bed plate 2 and the frame 64 (as shown in FIG. 12). The three levers are of the shapes as shown in FIG. 14. Of these three, the lever 30 is rotatably provided on the spindle 9 by means of bearing hole 30d with its tip 30a making contact with the periphery 161 of the aforesaid cam 10. The other end 3tle through the intermediary of a connecting bar 58 is coupled to a crank piece 59 at the bottom end of an upright shaft 7, the top end of which extends as far up as the inside of the machine arm. An arm 60 which is attached to the top end of the upright shaft 7 through the intermediary of a member 61 actuates the mechanism which imparts vibration to the needle bar for performing zigzag sewing. And the fact that the amplitude is manually adjustable by means of a handle 6 through the intermediary of a lever 62 is similar to that of the conventional zigzag machine. By means of the above mechanism, the width of the zigzag stitches made by the sewing needle is automatically varied in accordance with the configurations of the profile of the cam 19.

Next, inasmuch as the lever 31 whose tip 3111 makes contact with the periphery 101A of the cam A is secured to the vertical spindle 9, it is actuated by the changes in the profile of the rotating cam 10A. As a result, the lever 31 actuates in conjunction with the shaft 9 an arm secured thereto, thereby causing changing movements to take place in a link 37 through a member 41 which is coupled at its end to said link 37 by means of a linkage pin 42, On the other hand, the lever 32, which makes contact with the periphery 191B of the cam 1013, being secured to a sleeve 34 journaled rotatably on the vertical spindle 9 rotates a lever 33 provided in one body with said sleeve, and through a link 37 coupled with a pin 36 to said lever 33 actuates a horizontal actuating bar connected to said link 37 with a pin 38. Hence, the movements that are imparted to the actuating bar 43 are the resultants of the movement of the member 41 resulting from the cam 10A through the link 37 and the movement of the lever 33 resulting from the cam 1013. To the actuating bar 43, a pair of parallel links 44 and 45 are attached which are pivoted at their other ends to a movable disc 54. This disc, in turn is connected with a disc 57 fixed to the machine bed plate with another pair of parallel links and 56 at right angle with the first pair of parallel links. By means of these parallel links, the longitudinal movements and the lateral movements of the aforesaid horizontal actuating bar-the former of which movements are controlled by the cam 10A and the latter of which are controlled by the cam 10B-are trans mitted exactly parallel to the circular holder 46 of the works such as fabrics, and the extended portion 47 thereof. As shown in FIG. 12, the circular holder 46 is mounted as to be adjustable with respect to its relative position by means of a groove 48 provided in the extended portion 47 and an adjusting screw 49. The works such as fabrics of shirts, which are held in the above holder 46 by means of a wire ring 50 attached to the internal side of the holder by spring pressure, are imparted lateral movements, a composite of that resulting from cams 10A and 108, as well as conjointly changes in the amplitude of the vibration of the needle bar and lower stitch mechanism, whereby the figures in accordance with the desired stitches are sewn on the fabrics. The 51 of FIG. 12 is that which is compressed with the hand for inserting and removing the wire ring 50, and 52 and 53 is the supporter for the works such as shirts, etc.

A plurality of sets of the aforesaid cams 10A and 10B are readied to meet the requirements of the various types of forms of the aforementioned figures and letters. A plurality of earns 10 are also provided for to meet the desired variety in the changes in the zigzag stitches that are needed. These may all be changed, as required, by merely loosening of the knob 19 shown in FIG. 9. And in this instance, for the purpose of turning the levers 30, 31, and 32 outwards out of the way, each of the levers are respectively provided with pull pieces 3%, 31b, and 32b projecting therefrom.

Having fully described a preferred embodiment of this invention, it will be obvious that the same may be varied in detail without departing from the spirit of the invention as set forth in the appended claim.

What is claimed is:

A device for use in combination with a zigzag sewing machine for the sewing of embroidered figures, said sewing machine having a needle bar and a bed plate, said device comprising a vertical shaft depending from and rotatably mounted in said bed plate, means to rotate said vertical shaft, a vertical shaft extension fixed to said vertical shaft for rotation therewith and extending above said bed plate, three cams removably mounted on and rotated with said vertical shaft extension, each of said cams having a camming surface, three levers, each having a tip in cam-following engagement with one of said camming surfaces, a vertical spindle rotatably mounted in said bed plate, one of said levers being rotatably mounted on said vertical spindle and having an end remote from its tip, a mechanism for imparting vibration to said needle bar for performing zigzag sewing, means connecting said end of said one lever to said mechanism whereby the width of the zigzag stitches may be automatically varied in accordance with the profile of the camming surface of one of said cams, a second of said levers being fixed to said vertical spindle at an end remote from its tip, whereby said vertical spindle is 1'0- tated by rotation of said second lever, a first arm having two ends, one end of said first arm being fixed to said vertical spindle for rotation therewith, the third of said levers being fixed to a sleeve at an end remote from its tip, said sleeve being rotatably mounted on said vertical spindle, a second arm having two ends, one end of said second arm being fixed to said sleeve, a link having two ends, one end of said link being pivotally connected to the other end of said first arm, the other end of said link being pivotally connected to the other end of said second arm, a horizontal actuating bar having two ends, a work holder having an extension, one end of said horizontal actuating bar being pivotally connected to said other end of said link, the other end of said horizontal actuating bar being fixed to said extension of said work holder, a first pair of parallel links, each having two ends, one end of each of said first pair of parallel links being pivotally connected to said horizontal actuating bar at a point remote from said work holder, a movable disk, the other end of each of said first pair of parallel links be ing pivotally connected to said movable disk, a second pair of parallel links, each having two ends, said second pair of parallel links being disposed at right angles to said first pair of parallel links, one end of each of said second pair of parallel links being pivotally connected to said movable disk, a stationary disk fixed to said bed plate, the other end of each of said second pair of parallel links being pivotally connected to said stationary disk, whereby the longitudinal and lateral movements of said work holder may be automatically varied in accordance with the profile of the camming surfaces of the other two cams.

References Cited in the file of this patent UNITED STATES PATENTS 813,122 Thrautmann Feb. 20, 1906 994,033 Richter May 30, 1911 2,653,557 Robert et al. Sept. 29, 1953 2,902,956 Broedner Sept. 8, 1959 2,932,267 Nickerson Apr. 12, 1960 2,939,414 Slinn June 7, 1960 

